Stir first three ingredients, pour over ice, add sparkling water, garnish with lime slice.
For the hibiscus ginger simple syrup, combine 1/2 cup sugar with 1 cup of water, 1 inch of fresh ginger sliced super thin, and 4-5 oz hibiscus blossoms in a saucepan. Bring to boiling then turn off and let steep for 1/2hr.